Pumping @ Work

Hi FTM here. I'm returning to work soon and worried about pumping. 1. I only have 2 breast pumps. What if I need to pump 3 times? Can I reuse the parts without sterilizing? (Don't think there's sterilizer in the office) 2. After pump, I plan to keep in cooler bags with ice packs then transfer to fridge/freezer when I reach home. Is it ok? If I transfer from cooler bag to fridge, is it still good for 3 days? If I transfer from cooler bag to freezer, is it still good for 3 months? For mums with similar situation, is it very tiring honestly 😭 worried that I might give up on Breastfeeding after returning to work.